diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index 227b178135..a0f0d1a455 100644
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@@ -112,6 +112,7 @@ static av_cold int mp_decode_init(AVCodecContext *avctx)
     mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
     mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
     mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel));
+    avctx->pix_fmt = PIX_FMT_RGB555;
     return 0;
 }
 
diff --git a/libavformat/mvi.c b/libavformat/mvi.c
index 2dc4667a68..89c47da473 100644
--- a/libavformat/mvi.c
+++ b/libavformat/mvi.c
@@ -86,7 +86,6 @@ static int read_header(AVFormatContext *s, AVFormatParameters *ap)
     av_set_pts_info(vst, 64, msecs_per_frame, 1000000);
     vst->codec->codec_type = CODEC_TYPE_VIDEO;
     vst->codec->codec_id   = CODEC_ID_MOTIONPIXELS;
-    vst->codec->pix_fmt    = PIX_FMT_RGB555;
 
     mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? get_le16 : get_le24;